Finding the Fourth Proportional to 31,057.60, 42,860 and 16,910.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,057.60 : 42,860 = 16,910.72 : x
2. Step 2: Convert to fraction form
   31,057.60/42,860 = 16,910.72/x
3. Step 3: Cross multiply
   31,057.60x = 42,860 × 16,910.72
4. Step 4: Simplify right side
   31,057.60x = 724,793,459.20
5. Step 5: Solve for x
   x = 724,793,459.20/31,057.60
6. Step 6: Final answer
   x = 23,337.07